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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c329a51c8a15b7bf5c36195248f7b9acea537b84cf6485c892a9faadc27d37' 
  AND token = '2IbSVzo2CcU4ftjFvDEJgDrQUm9ebou3+zSbhnTT3oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}